| http://www.w3.org/ns/prov#value | - Some of these materials, such as pesticides, herbicides and industrial and commercial runnoff are also directly toxic to seagrasses and may cause localized die-backs in exposed seagrass beds.Human activity has other direct impacts upon segrasses; For example, outboard motors can can cause long lasting "scars" and eliminate seagrasses from large, heavily used areas.
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